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  1. K

    Where is the serial number?

    OK, here's some pics. Looked over it again and don't see any Welsh plugs with stamps (had one on the old Johnson 9.9). Don't see anything on the swivel bracket. After looking through a bunch of online parts catalogs, it looks like the impeller is a Sierra 18-3052, just by matching up...
  2. K

    Where is the serial number?

    I have (what I think) is an early 80's 20HP Mercury outboard. Can't find a plate that has the serial number on it. Where would I find this? All I know about the motor so far is it has a "Thunderbolt" ignition and two-tone blue strip on the cowling. It is a two cylinder two stroke. I'm...
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